Hydra arrays sequence a number of missile launchers to fire at once. The gunner designates up to three targets and can then make three rolls to hit divided among them. Each successful hit on a target allows the gunner to roll damage once, but only the highest damage roll is applied to the target. Thus, if all three volleys were aimed at a single target and two of them hit, the gunner would roll damage twice and apply the best result. A volley from the array costs 150 credits.
Some weapons are simply too big to be comfortably used without a tripod, fixed support, or vehicle mounting. Others require specialized training in the use of heavy munitions.
Hydra arrays use missiles as given on the gear tables.
Some heavy guns can be fired to suppress. Double the usual ammunition is fired in one round, and every target in front of the weapon that is not under hard cover is automatically hit for half normal damage. A successful Evasion saving throw eliminates this damage.